The ACIS system helps most with the lower torque curve but it also helps ensure a more consistent flow to all of the cylinders. The system just consists of the upper intake plenum (surge tank) and the "Y" pipe, a vacuum canister, one VSV and different throttle body. I can't remember which VSV output it is on the ECU... I THINK it's just labeled VSV1 or VSV2 in the service manuals... can't look right now and I don't have a MKIII here to check for ya.
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